Run and Debug zig program and tests

[seg4lt]

• Added ability to run the zig project and individual zig files
• You can debug and run your tests
• Added a command to run and debug current project or file from command palette.

[seg4lt]

I tried to add a grouping, but it gets weird when you try to run grouped test, so removed a commit.

[Vexu]

This seems to work quite nicely. It'd be nice if you could control whether the main should be run with build.zig or not since those two may not be connected.

Sorry for the delayed review.

[seg4lt]

I think I agree with you on running main - but I couldn't find elegant approach to solve the problem. My thought with this approach was this hopefully solves majority of use-cases.

[Vexu]

Thanks!